Electric lamp



July 30, 1929.. z. RID'DLE 1,722,640

ELECTRIC LAMP Filed oct. 27, 1924 2 sheets-sheet 1 4 Fifa? -5 gwuwnhwZEL/E /P/DDL E.

lum mm1 Z. RIDDLE ELECTRIC LAMP 'July 3o, 1929.

2 Sheets-Sheet 2 Filed 001'.. 27, 192,4

31s uch i01- Patented July 30,- l92 9.

' UNITED sTATEs l 1,722,640 PATENT OFFICE.

zELIE NIDDLE, 'or sAN DIEGO, CALIFORNIA. AssIGNon or SIXTY PER. CENT 'roDEAN.:

v xinx, or BELL, CALIFORNIA, AND 'rw OF SAN DIEGO, CALIFORNIA.

ELECTRIC LAMP.

ENTY- PER CENT T WAYNE IR. HANCOCK,

Application filed October 27, 1924. Serial o. 746,077.

My invention relates to a multi-filament electric lamp, and the objectsof my invention are: First, to provide an electric lamp of this classwhich, when one of its illuminating filaments is burned out or otherwisebroken, may be readily manipulated so as to bring another metallicilluminating filament into action; second, to provide an electric lamp'having a plurality 0f independent filamentsenclosed in .an envelope andadapted to be independently connected to a. source of electrical energy,as desired; third, to provide a novel combined multifilament electriclamp and socket therefor;

fourth, to provide amulti-filament electric lamp for' lighting purposeshaving a plurality of circularly arranged contacts adapted toindependently engage a contact means in the socket means therefor;fifth, to provide a lamp of this class having the life of two or morelamps, one which may be manufactured at a. cost of considerably lessthan a number of separate lamps aggregatingl an equal life, and onewhereby all the illuminating filaments maybe removed, repaired orreplaced, when repairing the lamp, during one opening of the enclosingbulb, thereby greatly reducing the expense in repairing electricilluminating lamps; sixth, to provide an electric lamp ofthis classwhich has substantially greater repairing value thanl the lamps now on)the market; seventh, to provide a novelly constructed multi-filamentelectric lamp; eighth, to rovide a novelly constructed socket means or alamp of this class, and one which is ,adaptable for the conventionalelectric screw outlet, and ninth, to provide a lamp of this class .whichis very simple pf construction, durable,eliicient and which will notreadily deteriorate or get out vof order.

With these other objects inl view, as will appear hereinafter,myinvention consists of certain novel lfeatures of construction`combina'tion and arrangement of parts and portions, as will behereinafter described in detail'a'nd particularly set forth intheappended claim, reference being had to thel accompanying drawings and tothe characters of reference thereon, which form a part of thisapplication, in which: -v

Figure 1- is a side'elevational v'iew of my electric lamp, with aportion of the bulb broken away and in section to facilitate theillustration; Figs.'2, 3`,'4 and 5 are transverse sectional viewsthereof, taken respectively through 2 2, 3 3, 4 4 and 5 5 of Fig. 1;Fig. 6 is aview of the end of the filament supporting rod and the endfilamentsupported thereon; Fig. 7 Ais a transverse sectional view of thelamp, taken through 7 7 of Fig. 1; Fig. 8 is a side elevational view ofmy socket means adapting my lamp to a conventional electric screwsocket, showing a fragmentary portion of the lamp .secured in the socketportion thereof; Fig. 9 is a longitudinal sectional view of the socketmeans, with the section taken through the middle thereof,'showingcertain parts and portions in elevation to facilitate the illustration;Fig. 10 is an end y,

view thereof; Figs. 11 and 12 are transverse sectional views thereof,taken respectively through 11 11 and 12 l2 of Fig. 9, and

Fig. 13- is a sectional view thereof, taken through 13 13 of Fig. 12. l

` Like characters of reference refer to similar parts and portionsthroughout the several views of the drawings. The bulb 1, filamentsupporting tube 2, lament'supporting rod 3, lead wires 4 and 5,illuminating filaments 6, filament supporting wires 7, lampsecuring basemember 8, cement 9, insulating terminal sleeve supportingdisc 10,terminal sleeves 11 and' 12, solder beads 13, lead wire separating plug14, socket casing member 15, thumbscrews 16, socket insulating member17, annular screw plug member 18, screws 19, nut 20, spring contactmember 21, contact plunger retaining member 22, screw l2,3, contactplunger 24, and the spring 25, constitute the principal parts andportions of my electric lamp structure.

The bulb 1 of my incandescent electric lamp is constructed similarly tothe bulbsof ,p

glass. This rod 3 is provided at its end and intermediate its ends witha plurality of enlarged concentric portions or rosettes 3 around whichand on which are supported the annularly arranged, coiled, illuminatingmetallic filaments 6. Although I have shown five separate andindependent filaments positioned within the bulb 1, this number may bemore or less, as long as no departure is made from the spirit of theinvention. These filaments are supported on the enlarged portions orrosettes 3fL of the rod 3 by means of filament supporting wires 7, asinthe conventional construction.

In the tube 2 are positioned six lead wires, the one'indicated by 4being connected to and adapted to supply energy to all of the filaments6, and the other five lead wires, indicated by 5, being each connectedwith one of the filaments 6 at the ends opposite to those connected withthe lead Wire 4. It will be here noted that the lead wires arepreferably made of relatively small diameter or light Wire sections 4aand 5a within the tube 2 and relatively heavy and stiff' wire sections4b and 5b of tungsten or'otlier suitable material outside of the tube 2and directly connected to the filaments, the sections 4b and 51 beingwelded or otherwise secured to the sections 4SL and 5, respectively,within the glass portion at the end of the tube 2, substantially asshown. The outer ends of the stiff wire sections 4b and 5b of the leadwires 4 and 5, respectively, are `preferably anchored in the enlargedportions or rosettes 3a to which they extend. I

The neck portion 1a of the bulb 1 is provided at its end with a reducedportion 1b which is in turn provided at its end with a slightly enlargedannular portion 1.. Around the reduced portion 1b at the base end of thebulb 1 is positioned an annular metallic bulb supporting base member 8,which is secured relatively to the bulb 1 by means of an insulatingcement or other suitable plastic material 9. At the outer end of thebase member 8 is secured the lead wire sleeve supporting disc 10,preferably by crimping the outer edge of the member 8 inwardly, as shownbest in Fig. 9. This disc 10 is made of fiber or other similar material.At the middle portion of this disc is secured a metallic sleeve 11through which extends the common lead wire 4, which wire is securedrelatively thereto by solder 13 at the outer end thereof, which solderforms a rounded or beadlike contact member. Arranged in circular orderaround the sleeve 11 and extending through the disc 10 are five othersleeves 12 through which the other fiveseparate lead wires extend, saidlast mentioned lead wires being also secured to the sleeves 12 by meansof solder, as previously described. Thus a central common contact forall the filaments in the bulb and a plurality of annularlyarranged'contacts for each of the filaments within the bulb are formedat the end of the lamp structure. At the normally outer end of the tube2 is provided a plug 14 which spaces the lead wires 4 and 5 therein andfrom each other, and is also adapted to prevent the cement or otherplastic material 9 from flowing into the tube 2. This plug may be madeof asbestos wool or other similar material.

The socket means of my lamp structure consists of-a plug portion adaptedto be secured in a conventional electrical outlet and a socket portioninto which the plug portion of the lamp, formed by the base member 8, issecured. ,The socket portion of the socket means is formed from anannular metallic band or socket member 15 which is secured .at its oneend, by means of inwardly depressed portions 15, to the one endet theinsulating member 17 nade of porcelain or other suitable material. Atthe opposite end of the member 15 are provided a pair of oppositelydisposed thumbscrews 16, which extend therethrough and are adapted 4toengage at their inner ends an annular groove portion 8a near the end ofthe base member 8 of the lamp nearest the bulb portion thereof,substantially as shown in Fig. 9. The `.pposite or outer end-of theinsulating member 17 is slightly reduced` and around said reducedportion thereof is positioned the annular screw plug member 18 which issecured to the insulating member 17 by means of two screws 19 whichextend inwardly from the outer end thereof to the inner end. At theinner end of the one screw 19 is provided a nut 20 and at the inner endof the other' screw 19 is'provided a spring contact member 21 having anut portion 21l and a spring contact portion 211. At the inner end ofthe insulating member 17 and contiguous to the inner ends of the screws19 are provided recesses 17a and 17'b in which respectively the nut 20and the nut portion 21CL of the member 21, are positioned. The contactmember 21 is accurately shaped and is positioned substantiallyconcentrically with the aXis of the insulating member and extendsoutwardly from the inner face thereof, substantially as shown in Fig.13, so as to permit the annularly arranged contacts of the lampstructureto engage the same.

Extending through the central portion of the insulating member 17 is acontact plunger retaining member 22 in the form ofu tube, which issecured in position relatively thereto by means of the contact screw 23which is adapted to serve as one of the contacts for connecting the lamptoa source of electrical energy. At the inner end of the member 22 isreciprocally mounted a plunger 24, between which and the inner end ofthe screw 23 is positioned a compression spring 25, the one end of theplunger'24 extending from the inner end of the tube member 22 andadapted to engage the centrally positioned Contact at the end of thelamp structure.

lVhen one of the filaments in the bulb is burnt out or broken, the bulbis merely rotated a fifth of a revolution or any multiple thereof so asto connect any of the other annularly arranged contact members on thelamp with the spring Contact member 21 of this socket means.

It is obvious from this construction, as illustrated in the drawings anddisclosed in the foregoing specification, that there is provided amulti-filament electric lamp structure and socket therefor, as aimed atand set forth in the objects of the invention, and though I have shownand described a particular construction, combination and arrangement ofparts and portions, I do not wish to be limited to this particularconstruction, combi'nation and arrangement, but desire to include in thescope of my invention the construction, combination and arrangementsubstantially as set forth in the appended claim.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

In an incandescent electric lamp structure, a bulb, a filament supportextending therein from one end thereof, a plurality of independentilluminating metallic filaments arranged around and supported by saidsupport Within said bulb, a single lead Wire extending into said bulbfrom said one end and connected with each of said filaments, a

4plurality of separate lead Wires extending into said bulb from said oneend, each one of said lead Wires being connected to a single filament, aplurality of circularly 'arranged contacts connected with said pluralityof lead Wires only, another contact positioned at the central portion ofsaid circularly ar ranged contacts and connected with said single leadWire, an annular bulb supporting base' member secured around-said oneend of said bulb and provided `With an annular groove in its periphery,and a plug socket means adapted to tit over the base member of said bulband revolubly support the same, said socket means being provided with apair of yieldable contacts, one adapted to engage said circularlyarranged contacts of said bulb, one at a time, and the other of saidyieldable contacts adapted, upon rotation, to engage the contactpositioned at the central portion of said circularly arranged contacts,said yieldable contacts being adapted to make contact with said bulb.

In testimony whereof, I have hereunto set my hand at San Diego,California, this 20th day of October, 1924. l

ZELIE RIDDLE.A

